. Electric railway journal . f oil be used it willform an airtight joint about the edges of the slidevalve, and since there is usually some leakage under theslide valve the pressure under the slide valve will even-tually become atmospheric. As a result, since the slidevalve is held to its seat with a pressure equal to itsarea, multiplied by the difference in pressure per squareinch acting on its upper and lower faces, the slide valvemay be held against its seat with a greater force thanif oil were not used. For if oil is not used leakage willcause the pressure under the slide valve to be at so
. Electric railway journal . f oil be used it willform an airtight joint about the edges of the slidevalve, and since there is usually some leakage under theslide valve the pressure under the slide valve will even-tually become atmospheric. As a result, since the slidevalve is held to its seat with a pressure equal to itsarea, multiplied by the difference in pressure per squareinch acting on its upper and lower faces, the slide valvemay be held against its seat with a greater force thanif oil were not used. For if oil is not used leakage willcause the pressure under the slide valve to be at somepoints that of the reservoir, at others atmospheric andat still others something between the two. The averagepressure is, however, lower than in the case where oilis used. The force holding the slide valve to its seat isconsequently less and the friction that must be overcomebefore movement likewise less. Oil may therefore be a ■--1 1 ^^^H »•-■ 1 ^^H M^ ^-^ ■ in Bl bki fm 111 ^^^sH^HIk 9g| H ^^^H mm. -rv^. \ i^V 1. AT LEFT, PIPING TO BRAKE VALVE AND FOOT VALVE. IN CENTER, BRINGING PIPING BACK OF CONTROLLER. AT RIGHT. DOOR AND STEP CONTROLLER INSTALLATION 1244 Electric Railway Journal Vol. 55, No. 25 REPAIK PARTS TO BE CARRIED FOR AIR BRAKE AND SAFETY CAR CONTROL. EQUIPMENT ON TWENTY-FOUR CARS Brake valves: 1 Brake valve, M-28, less pipe bracket and handle, 2 Brake valve handles, 6 Upper brake valve gaskets,6 Lower brake valve gaskets,4 Brake valve handle 15 doiibls check valves:6 Gaskets Controller attachments:2 Controller handles,2 Controller pilot valves,2 Controller handle base por-tions. Circuit breaker cylinder:2 Piston rod knob covers. Brake cylinder:6 Brake cylinder and step controllers: 1 Door and step controller,8 Leather cups, 8 Cylinder end valves: 2 Combined foot and cutoffvalves. Grofhite grease:10 lb. graphite grease. Compressors and parts:1 Compressor, complete,12 Inlet valves,1 Cylinder head, complete,4 Cy
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
